When an aspiring dancer is murdered backstage during Cirque du Soleil's KA show, the CSIs investigate what goes on behind-the-scenes to uncover the truth, on part one of the two part seventh season premiere. Grammy Award-winning recording artist John Mayer makes a cameo appearance, performing two new songs from his third studio album, "Continuum." Mayer performs his current single, "Waiting on the World to Change," as well as "Slow Dancing in a Burning Room," for Catherine and Nick at a nightclub.

Danny Bonaduce ("The Partridge Family") also guest stars as an ex-rocker who ends up a murder victim.

The CSIs investigate first-hand the behind-the-scenes action of Cirque du Soleil in order to determine what may have contributed to the young dancer's untimely death. Meanwhile, after Catherine and Nick visit a nightclub where John Mayer is performing, Catherine finds herself in jeopardy and must act as her own CSI in order to determine who may be targeting her and her family. Also, Grissom is perplexed after receiving an uncanny miniature replica of the crime scene he is investigating. (09/21/2006)